Pneumatic or elastic tire.



G. BURNETT.

PNEUMATIC 0R ELASTIC TIRE.

APPLICATION FILED MALT, 1911.

Patented Mar. 31, 1914.

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CUTHBERT BURNETT, 0F DURHAM, ENGLAND.

' PNEUMATIC OR ELASTIC TIRE.

Specification of Letters Patent.

l All? 338i).

Patented Mar. 31, 1914.

Application filed March 7, 1911. Serial No. 612,920.

To a]! whom. it may com-cm.

llc it known that I. Cn'rnnrn'r Bunnnrr, 1: subject of the Kingdom of Great Britain, residing; nt Belmont House. Durham,- in tho county of Durlnnn. England, engineer, have invented certain new and useful 11nlillJTGll'lQlllB in or Relating to Pneumatic or Elustic Tires, of which the following is u specification.

This invention relates to improvements in resilient tires, and refers more particularly to tho trend of tires such as are used on motor vehicles. tri-curs, motorcycles, and the like.

This invention provides a. trend for vehicle tires .vrhich ctl'cctuully provides :iguinst skidding or slipping in both a lotcrul and forward direction.

The present invention consists in the conibinution of n series of transverse ribs defining depressions, said depressions having the form of crosses or rhoinboids. By this nrrmigcincnt the said depressions ore enubled to function as suction cups and apprcdubly tend to reduce the skidding and slipping of the vehicles to which the tires constructed according to my invention are applied. Also the said ribs furnish more effective gripping means than in the case with a. smooth tread tire, due to the biting: effect of the sh urp edges and corners thereof.

In some cases it may be desirable to direct the transverse ribs at angles of a lesser or greater number of degrees than shown in the .lllLlSiIui-lOIl, as by varying the size of the angles at which the ribs intersect the number of suction cups produced by the in tor-section of the ribs may be varied. For

instance, if the angle of intersection be made smaller additional suction cups are nvailable and a larger treadsurfa-ce is presented to Withstand the wear. In all cases it substantial body of the material compris ingthe trend is included in the transverse ribs, thereby enabling the tire to retain its i'l'ilClllVG qualities even after having been subjected to considerable Wear.

Referring to the drawings attached hereto and forming a port of this specification, and in which 1 illustrate the preferred embodiment of my invcntionz l igure l is an elevational view of the portion of a tire constructed according to my invention. Fig. 2 is a transverse section on the line 3% of Fig. l

Referring to thedrawing: The embodr incnt illustrated herein is constructed by a1 ranging on the trend surface of the tire a series of transverse ribs 4: having their ends ollsct with respect to each other, in the man nor illustrated. The said ribs intersect in the nuniner shown so as to define on the surface of the trend series of suction cups (2 having the rectangular form, and a so rics of suction cups is having the form of a cross, the arms or the cross designated by the reference character These ribs also llCllllC. at the edge of the tread, a series of indentations j and j". The suction cups have n tendency to hung to the ground as the wheel revolves, and also the edges of the ribs which form the Walls of the suction cups and indentations, bite into the ground. It will be seen that the combination of these two make an oil ctive means for roventing skidding or slippin The pro erziblc arrnngiinent of intersecting the ribs, which is shown in the drawing, produces the suction cups of the form shown, which are disposed alternately With respect to each other nnd diagonally with respect to the line of drive.

It will c obvious that although I have as being of square and rectangular configuration, these may be of any suitable in which the ribs are made to intersect.

In all cases it will be understood that sullicicnt material is to be embodied in the ribs to present an effective tractive portion and to isolate the suction cups and thus preserve their internal vacuum after the the has been subjected to consideroble wear.

what I claim is I A tire having a trend portion provided with raised sets of broad trend ribs extending in crossed relation With respect to euch other from one lateral margin of the tire. trend to the other, each rib having its ends offset with respect to each other, the ribs of one set crossing the ribs of the other set at. the central line of drive of the trend and the ends r the ribs or one set merging with the ends of the. ribs of the other set at the margins of the tire tread, the ribs of each set being substantially parallel and uniformly spaced spurt from each other a distuncc exceeding the width of one rib, said ribs thereby forming a series of relatively spacious suction cups along the line or" described and illustrated the suction cups Having thus described my invention,

shape depending on the angle and manner I tread, the inner margins of the ribs and a1- In Witness whereof I have hereunto se' ternatecups having pointed projections'exmy hand in the presence of two Witnesses. tending toward the center of such cups cer- 1 1 min of said points coinciding With the line CW1 HBERF N of drive and the remaining points projecting at an angle to the line of drive, substantial ly as described.

' Vitnesses:

H. NIXON, E. ALEXANDER. 

